Questions about Mon-El ?

Ok I have some questions about Mon-El. I know this might sound crazy but is there more then one ? I ask because mon-el was introduced before Crisis on Infinite Earths and put into the Phantom Zone for 1000 year then freed by the Legion of Super-Heroes. But on Earth 247 http://dc.wikia.com/wiki/Lar_Gand_(Post-Zero_Hour) and Earth Prime http://dc.wikia.com/wiki/Lar_Gand_(Earth-Prime) there is a mon-el to.

Funny, I was just reading about Superboy Prime killing the Legion of Super-heroes and I noticed him there. I'd imagine lol, this is comics and there multiple versions of everybody and their mom.

ok I finally found out how mon-el is no longer a green lantern he gives up his ring in Legion of Super-Heroes #16 - Endings but that still dose not answer my others questions. ok let me re-start this he first showed up before crisis on infinite earth then in the post zero hour he joins the team but in new earth dc erased the superboy stories so how could mon-el be in earth 247 1000 years later same for the earth prime mon-el or was there a mon-el who was put into the phantom zone in earth 247 and earth prime ?

I would check out a website called Cosmic Teams and look at their LoSH related material. They seem to explain a lot about the team and it's continuity